Facebook Chat

Well, first of all... i would like to introduce myself to the community of WP7. I really like WP7 and reading WPcentral... so thanks

Now... i don't know if my phone have something wrong or the facebook chat is not working. The first time i upgraded to Mango i was able to connect to the facebook chat but now i "can't". Sometimes won't connect or no one will appear online...

Anyone who can help me?

PS: sorry for my English...
PS2: i use people and message to chat on facebook